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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) Including Reclassification Adjustments by Income Statement (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward] |  |  |  |  |  |  |  |
Pretax total accumulated other comprehensive income (loss), beginning balance | $ (128) | $ (2,180) | $ (1,809) | $ (2,053) |  |  |  |
Pretax total accumulated other comprehensive income (loss), Investment securities | 362 | 2,013 | 2,028 | 1,514 |  |  |  |
Pretax total accumulated other comprehensive income (loss), before reclassifications | 362 | 2,013 | 2,028 | 1,514 |  |  |  |
Pretax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | 3 | 36 | (11) | (336) |  |  |  |
Pretax total accumulated other comprehensive income (loss), Interest expense |  |  | (1) |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax |  |  | 0 |  |  |  |  |
After tax total accumulated other comprehensive income (loss), Interest expense |  |  | (1) |  |  |  |  |
Total reclassification adjustment for amounts realized in net income, pre tax | 3 | 36 | (12) | (336) |  |  |  |
Total other comprehensive income (loss), pre tax | 359 | 1,977 | 2,040 | 1,850 |  |  |  |
Pretax total accumulated other comprehensive income (loss), ending balance | 231 | (203) | 231 | (203) |  |  |  |
Stockholders' Equity Attributable to Parent | 35,445 | 27,159 | 35,445 | 27,159 |  | $ 25,591 |  |
Accumulated Other Comprehensive Income (Loss), Tax [Roll Forward] |  |  |  |  |  |  |  |
Total tax (provision) benefit, beginning balance | 33 | 464 | 386 | 437 |  |  |  |
Total tax (provision) benefit, Investment securities | (76) | (423) | (426) | (318) |  |  |  |
Total tax (provision) benefit, before reclassifications | (76) | (423) | (426) | (318) |  |  |  |
Total tax (provision) benefit, Net realized gains (losses) on securities | (1) | (7) | 2 | 71 |  |  |  |
Total reclassification adjustment for amounts realized in net income, Total tax (provision) benefit | (1) | (7) | 2 | 71 |  |  |  |
Total other comprehensive income (loss), tax (provision) benefit | (75) | (416) | (428) | (389) |  |  |  |
Total tax (provision) benefit, ending balance | (42) | 48 | (42) | 48 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
After tax total accumulated other comprehensive income (loss), beginning balance | (95) | (1,716) | (1,423) | (1,616) |  |  |  |
After tax total accumulated other comprehensive income (loss), Investment securities | 286 | 1,590 | 1,602 | 1,196 |  |  |  |
After tax total accumulated other comprehensive income (loss), before reclassifications | 286 | 1,590 | 1,602 | 1,196 |  |  |  |
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | 2 | 29 | (9) | (265) |  |  |  |
Total reclassification adjustment for amounts realized in net income, after tax | 2 | 29 | (10) | (265) |  |  |  |
Total other comprehensive income (loss), after tax | 284 | 1,561 | 1,612 | 1,461 |  |  |  |
After tax total accumulated other comprehensive income (loss), ending balance | 189 | (155) | 189 | (155) |  |  |  |
Total net unrealized gains (losses) on securities |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward] |  |  |  |  |  |  |  |
After tax total accumulated other comprehensive income (loss), Interest expense |  |  | 0 |  |  |  |  |
Stockholders' Equity Attributable to Parent | 203 | (140) | 203 | (140) | $ (81) | (1,408) | $ (1,701) | $ (1,601)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
After tax total accumulated other comprehensive income (loss), Investment securities | 286 | 1,590 | 1,602 | 1,196 |  |  |  |
After tax total accumulated other comprehensive income (loss), before reclassifications | 286 | 1,590 | 1,602 | 1,196 |  |  |  |
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | 2 | 29 | (9) | (265) |  |  |  |
Total reclassification adjustment for amounts realized in net income, after tax | 2 | 29 | (9) | (265) |  |  |  |
Total other comprehensive income (loss), after tax | 284 | 1,561 | 1,611 | 1,461 |  |  |  |
Net unrealized losses on forecasted transactions |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward] |  |  |  |  |  |  |  |
After tax total accumulated other comprehensive income (loss), Interest expense |  |  | (1) |  |  |  |  |
Stockholders' Equity Attributable to Parent | (13) | (14) | (13) | (14) | (13) | (14) | (14) | (14)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
After tax total accumulated other comprehensive income (loss), Investment securities | 0 | 0 | 0 | 0 |  |  |  |
After tax total accumulated other comprehensive income (loss), before reclassifications | 0 | 0 | 0 | 0 |  |  |  |
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | 0 | 0 | 0 | 0 |  |  |  |
Total reclassification adjustment for amounts realized in net income, after tax | 0 | 0 | (1) | 0 |  |  |  |
Total other comprehensive income (loss), after tax | 0 | 0 | 1 | 0 |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward] |  |  |  |  |  |  |  |
After tax total accumulated other comprehensive income (loss), Interest expense |  |  | 0 |  |  |  |  |
Stockholders' Equity Attributable to Parent | (1) | (1) | (1) | (1) | $ (1) | $ (1) | $ (1) | $ (1)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
After tax total accumulated other comprehensive income (loss), Investment securities | 0 | 0 | 0 | 0 |  |  |  |
After tax total accumulated other comprehensive income (loss), before reclassifications | 0 | 0 | 0 | 0 |  |  |  |
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | 0 | 0 | 0 | 0 |  |  |  |
Total reclassification adjustment for amounts realized in net income, after tax | 0 | 0 | 0 | 0 |  |  |  |
Total other comprehensive income (loss), after tax | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |

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